雷竹克隆系统出笋期有机碳分布变化规律

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 雷竹克隆系统出笋期有机碳分布变化规律 DOI: 10.5846/stxb201512142488 作者: 作者单位: 中国林科院亚热带林业研究所,中国林业科学研究院亚热带林业研究所,中国林业科学研究院亚热带林业研究所,中国林业科学研究院亚热带林业研究所,中国林业科学研究院亚热带林业研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 浙江省林业科技推广资助项目（2015B05）；中国林业科学研究院基本科研业务费专项资金项目（2016） Organic carbon allocation pattern and changes regulation in various organs of Phyllostachys violascens clone system in shooting period Author: Affiliation: Research Institute of Subtropical Forestry,Chinese Academy of Forestry,,,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:植物光合碳同化物为植物的生长提供所需的物质和能量。目前，对植物有机碳分布虽已展开了大量研究，但对竹类植物出笋期有机碳转移机制的研究还比较缺乏。测定了分株数量为单株、双株和三株的雷竹克隆系统出笋期分株各器官的有机碳含量，以期进一步了解雷竹克隆系统出笋期有机碳转移变化规律。研究发现：雷竹分株不同器官有机碳含量差异显著，且在出笋期发生显著变化，出笋前：枝（52.64%） > 叶（47.18%） > 秆（40.98%） > 鞭（40.13%） > 根（35.14%），出笋完成后：枝（48.20%） > 秆（47.84%） > 叶（45.53%） > 鞭（45.52%） > 根（44.29%），枝、叶有机碳含量呈先下降后上升趋势，根、秆、鞭有机碳含量呈“N”型变化规律；单株、多株系统雷竹分株各器官有机碳含量降幅与出笋量成反比，随分株数量增加，出笋量增加，而各器官有机碳含量降幅减小；双株系统中1年生雷竹各器官有机碳含量降幅大于2年生竹，三株系统中3年生雷竹各器官有机碳含量降幅大于1年、2年生竹。这些结果表明：出笋影响雷竹各器官有机碳分配格局，出笋时各器官间有机碳资源发生转移，其中枝、叶有机碳含量降低而根、秆、鞭有机碳含量增加；各器官间源-汇关系发生变化，分株间有机碳资源存在共享，分株数量增加出笋量增加且系统内分株的损耗减小；分株年龄是影响雷竹不同器官出笋期有机碳含量变化的影响因素之一。因此，调整雷竹林年龄结构对提高雷竹林出笋量及经济效益有十分重要的现实意义。 Abstract:Carbon assimilation from photosynthesis provides most substrates and energy for plant growth. To date, the distribution of carbon in various plant species has been intensively studied. However, information on carbon distribution during the shooting period in bamboo plants is limited. In this study, carbon distribution in different organs of Phyllostachys violascens plants with one, two, or three ramets was investigated during the shooting period, which enabled further study of the mechanisms that regulate bamboo species development. The results showed that the organic carbon content was significantly different in various organs of P. violascens and that it changed significantly during the shooting period. Before the shooting period started, organic carbon content decreased in the order branch > leaf > stem > ramet > root; after shooting was completed, it decreased in the order branch > stem > leaf > ramet > root. Organic carbon initially decreased and then subsequently increased in branch and leaf and there was an "N"-like variation in organic carbon content in root, stem, and rhizome. The decrease in organic carbon content was negatively related to the shoot yield in both single and multi-ramet plants. The magnitude of the reduction in organic carbon content of various organs decreased with increasing ramet number and shoot output. Variation in organic carbon content was also found between plants with different ramet age. In the two-ramet plants, the reduction in organic carbon content was larger in 1-year-old plants than in 2-year-old plants, and in three-ramet plants, the reduction in organic carbon content was larger in 3-year-old plants than in 2-year-old and 1-year-old plants. These findings indicate that bamboo shooting affects organic carbon allocation, with a decrease in branch and leaf content and an increase in root, stem, and rhizome content. The potential source-sink relationship of different organs changes to provide organic carbon for bamboo shoots. Physiological integration of photosynthetic products occurs within the clonal segments of P. violascens. With an increasing number of ramets, organic carbon in the shoots increased and loss of organic carbon in the ramets decreased. The organic carbon content also varied with P. violascens plant age during the shooting period. These findings have important practical implication in terms of shoot output and economic benefit, by adjusting the natural above-ground structure of P. violascens. 参考文献 相似文献 引证文献